全文获取类型
收费全文 | 2560篇 |
免费 | 311篇 |
国内免费 | 157篇 |
专业分类
化学 | 1925篇 |
晶体学 | 33篇 |
力学 | 115篇 |
综合类 | 4篇 |
数学 | 250篇 |
物理学 | 701篇 |
出版年
2024年 | 9篇 |
2023年 | 95篇 |
2022年 | 143篇 |
2021年 | 133篇 |
2020年 | 163篇 |
2019年 | 173篇 |
2018年 | 161篇 |
2017年 | 111篇 |
2016年 | 173篇 |
2015年 | 166篇 |
2014年 | 188篇 |
2013年 | 236篇 |
2012年 | 274篇 |
2011年 | 253篇 |
2010年 | 166篇 |
2009年 | 129篇 |
2008年 | 133篇 |
2007年 | 115篇 |
2006年 | 68篇 |
2005年 | 41篇 |
2004年 | 25篇 |
2003年 | 11篇 |
2002年 | 20篇 |
2001年 | 5篇 |
2000年 | 14篇 |
1999年 | 1篇 |
1998年 | 6篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 3篇 |
1991年 | 1篇 |
1990年 | 6篇 |
1986年 | 1篇 |
1985年 | 2篇 |
排序方式: 共有3028条查询结果,搜索用时 218 毫秒
941.
Yingbin Lv Peiyuan Li Rixiang Su Jinyun Cai Haiyi Zhong Fangzhou Wen Wei Su 《Photochemistry and photobiology》2023,99(1):92-100
Photodynamic therapy and photothermal therapy provide new ways to combat antibiotic resistance. In this research, methylene blue (MB) as an effective photosensitizer was conjugated with carbon quantum dots (CQDs), the composite product not only possessed good antibacterial properties against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) due to excellent singlet oxygen (1O2) production rate and light heat transfer performance, but also showed good biocompatibility. Combined with 808 nm and 660 nm laser irradiation, the minimum bactericidal concentration of CQDs-MB towards S. aureus and E. coli was 5 μm . Therefore, this study provides a potential candidate material based on CQDs for clinical applications. 相似文献
942.
Lv Zhu Mengyao Wu Ruiyu Li Yunyan Zhao Yang Lu Ting Wang Leilei Du Li Wan 《Electrophoresis》2023,44(17-18):1377-1404
The problem of pesticide residue contamination has attracted widespread attention and poses a risk to human health. The current traditional pesticide residue detection methods have difficulty meeting rapid and diverse field screening requirements. Microfluidic technology integrates functions from sample preparation to detection, showing great potential for quick and accurate high-throughput detection of pesticide residues. This paper reviews the latest research progress on microfluidic technology for pesticide residue detection. First, the commonly used microfluidic materials are summarized, including silicon, glass, paper, polydimethylsiloxane, and polymethyl methacrylate. We evaluated their advantages and disadvantages in pesticide residue detection applications. Second, the current pesticide residue detection technology based on microfluidics and its application to real samples are summarized. Finally, we discuss this technology's present challenges and future research directions. This study is expected to provide a reference for the future development of microfluidic technology for pesticide residue detection. 相似文献
943.
MOF衍生金属硒化物由于其有序的碳骨架结构和高导电性,被认为是钠离子电池极具前景的负极材料。它们具有快速的电子/离子输运通道,有利于钠离子的嵌入和脱出。然而,循环过程中的大量体积膨胀会导致结构坍塌。为了解决这个问题,通过表面改性在MOF衍生金属硒化物表面引入了一个二维的还原氧化石墨烯网络,既可以缓解体积变化,又能加速电子转移。实验证实这种策略是有效的,在1 A·g-1下500次循环后,包覆了还原氧化石墨烯的复合材料电极容量保持率提高到了95.2%。相比之下,不含还原氧化石墨烯的容量保留率仅为74.2%。此外,由于还原氧化石墨烯网络和MOF衍生In2Se3协同作用,在0.1 A·g-1下显示出了468 m Ah·g-1的优越容量。而在相同的电流密度下,未包覆还原氧化石墨烯的只产生393 m Ah·g-1的比容量。采用循环伏安法(CV)研究了In2Se3@C/rGO电极的电化学过程,结果表明其具有良好的电化学反应活性... 相似文献
944.
Prof. Guowei Li Dr. Qun Yang Prof. Kaustuv Manna Dr. Yudi Zhang Dr. Patrick Merz Chandra Shekhar Yang Zhang Dr. Hua Lv Dr. Anastasios Markou Dr. Yan Sun Prof. Claudia Felser 《Angewandte Chemie (International ed. in English)》2023,62(27):e202303296
The study of heterogeneous reactions for enantiomeric processes based on inorganic crystals has been resurgent in recent years. However, the question remains how homochirality develops in nature and chemical reactions. Here, the successful growth of B20 group PdGa single crystals with different chiral lattices enabled us to achieve enantioselective recognition of 3,4-dihydroxyphenylalanine (DOPA) based on a new mechanism, namely orbital angular momentum (OAM) polarization. The orbital textures of PdGa crystals indicate large OAM polarization near the Fermi level and carrying opposite signs. A positive or negative magnetization in the [111] direction is expected depending on the chiral lattice of PdGa crystals. Due to this, the adsorption energies of PdGa crystals and DOPA molecules differ depending on how well the O-2p orbital of DOPA pairs with the Pd-4d orbital of PdGa. The results provide one possible explanation for how chirality arises in nature by providing an enantioselective route with pure inorganic crystals. 相似文献
945.
Yuncong Xue Can Zhang Tongjin Lv Prof. Dr. Longzhen Qiu Prof. Dr. Feng Wang 《Angewandte Chemie (International ed. in English)》2023,62(18):e202300972
Circularly polarized photodetectors require chiral light absorption materials with high sensing efficiency and low costs. Here readily accessible point chirality has been introduced to dicyanostilbenes as the chiral source, facilitating remote chirality transfer to the π-aromatic core by cooperative supramolecular polymerization. The single-handed supramolecular polymers display powerful circularly polarized photodetection capability with a dissymmetry factor value as high as 0.83, superior to those of π-conjugated small molecules and oligomers. Strong chiral amplification occurs between the enantiopure sergeants and the achiral soldiers. The resulting supramolecular copolymers exhibit comparable photodetection efficiency to those of the homopolymeric ones, with a 90 % decrease in the enantiopure compound consumption. Therefore, cooperative supramolecular polymerization provides an effective yet economical avenue toward circularly polarized photodetection applications. 相似文献
946.
947.
Dr. Shenghua Chen Dr. Chengliang Ye Dr. Ziwei Wang Dr. Peng Li Dr. Wenjun Jiang Dr. Zechao Zhuang Dr. Jiexin Zhu Dr. Xiaobo Zheng Dr. Shahid Zaman Dr. Honghui Ou Lei Lv Dr. Lin Tan Dr. Yaqiong Su Dr. Jiang Ouyang Prof. Dingsheng Wang 《Angewandte Chemie (International ed. in English)》2023,62(50):e202315621
Electrochemical CO2 reduction reaction (CO2RR) over Cu catalysts exhibits enormous potential for efficiently converting CO2 to ethylene (C2H4). However, achieving high C2H4 selectivity remains a considerable challenge due to the propensity of Cu catalysts to undergo structural reconstruction during CO2RR. Herein, we report an in situ molecule modification strategy that involves tannic acid (TA) molecules adaptive regulating the reconstruction of a Cu-based material to a pathway that facilitates CO2 reduction to C2H4 products. An excellent Faraday efficiency (FE) of 63.6 % on C2H4 with a current density of 497.2 mA cm−2 in flow cell was achieved, about 6.5 times higher than the pristine Cu catalyst which mainly produce CH4. The in situ X-ray absorption spectroscopy and Raman studies reveal that the hydroxyl group in TA stabilizes Cuδ+ during the CO2RR. Furthermore, theoretical calculations demonstrate that the Cuδ+/Cu0 interfaces lower the activation energy barrier for *CO dimerization, and hydroxyl species stabilize the *COH intermediate via hydrogen bonding, thereby promoting C2H4 production. Such molecule engineering modulated electronic structure provides a promising strategy to achieve highly selective CO2 reduction to value-added chemicals. 相似文献
948.
Zhou-Yan Lv Gang Yang Bao-Ping Ren Zheng-Yan Liu Dr. Hao Zhang Dr. Li-Ping Si Prof. Dr. Hai-Yang Liu Prof. Dr. Chi-Kwong Chang 《欧洲无机化学杂志》2023,26(12):e202200755
Three isomeric A2B-type new cobalt triaryl corroles bearing hydroxyphenyl substituents have been prepared and well characterized. Their activity and stability in the electrocatalytic hydrogen evolution reaction (HER) have been investigated. The results showed that the hydroxyl position of the phenyl group had significant influence on electrocatalytic HER. The ortho-hydroxyphenyl substituted cobalt corrole ( 1 ) core displays the best HER activity using TsOH proton source, and the turnover frequency (TOF) and catalytic efficiency (C.E) reach 318.68 s−1 and 1.13, respectively. Moreover, a turnover number (TON) of 1447.39 and Faraday efficiency (FE) of 98.7 % have been observed in aqueous medium. The catalytic pathway is via EECEC, EECC or ECEC pathways depending on the acidity of acid proton source (E: electron transfer step, C: chemical step, in this case protonation). The catalytic HER performance of these cobalt corroles follows an order of o-hydroxyl > p-hydroxyl > m-hydroxyl isomer, showing the o- and p-hydroxyl of the phenyl groups are more efficient in accelerating proton relay. 相似文献
949.
Zhanhong Fang Bingyang Lv Jiamian Zhan Xianglong Xing Chengbin Ding Jianing Liu Leyu Wang Xiaoming Zou Xiaozhong Qiu 《Macromolecular bioscience》2023,23(12):2300207
Engineering cardiac patches are proven to be effective in myocardial infarction (MI) repair, but it is still a tricky problem in tissue engineering to construct a scaffold with good biocompatibility, suitable mechanical properties, and solid structure. Herein, decellularized fish skin matrix is utilized with good biocompatibility to prepare a flexible conductive cardiac patch through polymerization of polydopamine (PDA) and polypyrrole (PPy). Compared with single modification, the double modification strategy facilitated the efficiency of pyrrole polymerization, so that the patch conductivity is improved. According to the results of experiments in vivo and in vitro, the scaffold can promote the maturation and functionalization of cardiomyocytes (CMs). It can also reduce the inflammatory response, increase local microcirculation, and reconstruct the conductive microenvironment in infarcted myocardia, thus improving the cardiac function of MI rats. In addition, the excellent flexibility of the scaffold, which enables it to be implanted in vivo through “folding-delivering-re-stretehing” pathway, provides the possibility of microoperation under endoscope, which avoids the secondary damage to myocardium by traditional thoracotomy for implantation surgery. 相似文献
950.
Kaiqing Wu Prof. Ran Chen Prof. Zhixin Zhou Xinghua Chen Yanqin Lv Jin Ma Prof. Yanfei Shen Prof. Songqin Liu Prof. Yuanjian Zhang 《Angewandte Chemie (International ed. in English)》2023,62(12):e202217078
Facile evaluation of oxygen reduction reaction (ORR) kinetics for electrocatalysts is critical for sustainable fuel-cell development and industrial H2O2 production. Despite great success in ORR studies using mainstream strategies, such as the membrane electrode assembly, rotation electrodes, and advanced surface-sensitive spectroscopy, the time and spatial distribution of reactive oxygen species (ROS) intermediates in the diffusion layer remain unknown. Using time-dependent electrochemiluminescence (Td-ECL), we report an intermediate-oriented method for ORR kinetics analysis. Owing to multiple ultrasensitive stoichiometric reactions between ROS and the ECL emitter, except for electron transfer numbers and rate constants, the potential-dependent time and spatial distribution of ROS were successfully obtained for the first time. Such exclusively uncovered information would guide the development of electrocatalysts for fuel cells and H2O2 production with maximized activity and durability. 相似文献